Messages in this thread | | | Date | Tue, 12 Sep 2023 08:58:37 +0800 | From | kernel test robot <> | Subject | kernel/bpf/helpers.c:1920:19: warning: no previous declaration for 'bpf_refcount_acquire_impl' |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 0bb80ecc33a8fb5a682236443c1e740d5c917d1d commit: 7c50b1cb76aca4540aa917db5f2a302acddcadff bpf: Add bpf_refcount_acquire kfunc date: 5 months ago config: x86_64-randconfig-002-20230910 (https://download.01.org/0day-ci/archive/20230912/202309120843.Vt687y9F-lkp@intel.com/config) compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230912/202309120843.Vt687y9F-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202309120843.Vt687y9F-lkp@intel.com/
All warnings (new ones prefixed by >>):
kernel/bpf/helpers.c:1882:19: warning: no previous declaration for 'bpf_obj_new_impl' [-Wmissing-declarations] __bpf_kfunc void *bpf_obj_new_impl(u64 local_type_id__k, void *meta__ign) ^~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:1912:18: warning: no previous declaration for 'bpf_obj_drop_impl' [-Wmissing-declarations] __bpf_kfunc void bpf_obj_drop_impl(void *p__alloc, void *meta__ign) ^~~~~~~~~~~~~~~~~ >> kernel/bpf/helpers.c:1920:19: warning: no previous declaration for 'bpf_refcount_acquire_impl' [-Wmissing-declarations] __bpf_kfunc void *bpf_refcount_acquire_impl(void *p__refcounted_kptr, void *meta__ign) ^~~~~~~~~~~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:1945:18: warning: no previous declaration for 'bpf_list_push_front' [-Wmissing-declarations] __bpf_kfunc void bpf_list_push_front(struct bpf_list_head *head, struct bpf_list_node *node) ^~~~~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:1950:18: warning: no previous declaration for 'bpf_list_push_back' [-Wmissing-declarations] __bpf_kfunc void bpf_list_push_back(struct bpf_list_head *head, struct bpf_list_node *node) ^~~~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:1968:35: warning: no previous declaration for 'bpf_list_pop_front' [-Wmissing-declarations] __bpf_kfunc struct bpf_list_node *bpf_list_pop_front(struct bpf_list_head *head) ^~~~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:1973:35: warning: no previous declaration for 'bpf_list_pop_back' [-Wmissing-declarations] __bpf_kfunc struct bpf_list_node *bpf_list_pop_back(struct bpf_list_head *head) ^~~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:1978:33: warning: no previous declaration for 'bpf_rbtree_remove' [-Wmissing-declarations] __bpf_kfunc struct bpf_rb_node *bpf_rbtree_remove(struct bpf_rb_root *root, ^~~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:2015:18: warning: no previous declaration for 'bpf_rbtree_add' [-Wmissing-declarations] __bpf_kfunc void bpf_rbtree_add(struct bpf_rb_root *root, struct bpf_rb_node *node, ^~~~~~~~~~~~~~ kernel/bpf/helpers.c:2021:33: warning: no previous declaration for 'bpf_rbtree_first' [-Wmissing-declarations] __bpf_kfunc struct bpf_rb_node *bpf_rbtree_first(struct bpf_rb_root *root) ^~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:2034:33: warning: no previous declaration for 'bpf_task_acquire' [-Wmissing-declarations] __bpf_kfunc struct task_struct *bpf_task_acquire(struct task_struct *p) ^~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:2045:18: warning: no previous declaration for 'bpf_task_release' [-Wmissing-declarations] __bpf_kfunc void bpf_task_release(struct task_struct *p) ^~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:2057:28: warning: no previous declaration for 'bpf_cgroup_acquire' [-Wmissing-declarations] __bpf_kfunc struct cgroup *bpf_cgroup_acquire(struct cgroup *cgrp) ^~~~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:2069:18: warning: no previous declaration for 'bpf_cgroup_release' [-Wmissing-declarations] __bpf_kfunc void bpf_cgroup_release(struct cgroup *cgrp) ^~~~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:2081:28: warning: no previous declaration for 'bpf_cgroup_ancestor' [-Wmissing-declarations] __bpf_kfunc struct cgroup *bpf_cgroup_ancestor(struct cgroup *cgrp, int level) ^~~~~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:2101:28: warning: no previous declaration for 'bpf_cgroup_from_id' [-Wmissing-declarations] __bpf_kfunc struct cgroup *bpf_cgroup_from_id(u64 cgid) ^~~~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:2118:33: warning: no previous declaration for 'bpf_task_from_pid' [-Wmissing-declarations] __bpf_kfunc struct task_struct *bpf_task_from_pid(s32 pid) ^~~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:2157:19: warning: no previous declaration for 'bpf_dynptr_slice' [-Wmissing-declarations] __bpf_kfunc void *bpf_dynptr_slice(const struct bpf_dynptr_kern *ptr, u32 offset, ^~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:2234:19: warning: no previous declaration for 'bpf_dynptr_slice_rdwr' [-Wmissing-declarations] __bpf_kfunc void *bpf_dynptr_slice_rdwr(const struct bpf_dynptr_kern *ptr, u32 offset, ^~~~~~~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:2265:19: warning: no previous declaration for 'bpf_cast_to_kern_ctx' [-Wmissing-declarations] __bpf_kfunc void *bpf_cast_to_kern_ctx(void *obj) ^~~~~~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:2270:19: warning: no previous declaration for 'bpf_rdonly_cast' [-Wmissing-declarations] __bpf_kfunc void *bpf_rdonly_cast(void *obj__ign, u32 btf_id__k) ^~~~~~~~~~~~~~~ kernel/bpf/helpers.c:2275:18: warning: no previous declaration for 'bpf_rcu_read_lock' [-Wmissing-declarations] __bpf_kfunc void bpf_rcu_read_lock(void) ^~~~~~~~~~~~~~~~~ kernel/bpf/helpers.c:2280:18: warning: no previous declaration for 'bpf_rcu_read_unlock' [-Wmissing-declarations] __bpf_kfunc void bpf_rcu_read_unlock(void) ^~~~~~~~~~~~~~~~~~~
vim +/bpf_refcount_acquire_impl +1920 kernel/bpf/helpers.c
1877 1878 __diag_push(); 1879 __diag_ignore_all("-Wmissing-prototypes", 1880 "Global functions as their definitions will be in vmlinux BTF"); 1881 > 1882 __bpf_kfunc void *bpf_obj_new_impl(u64 local_type_id__k, void *meta__ign) 1883 { 1884 struct btf_struct_meta *meta = meta__ign; 1885 u64 size = local_type_id__k; 1886 void *p; 1887 1888 p = bpf_mem_alloc(&bpf_global_ma, size); 1889 if (!p) 1890 return NULL; 1891 if (meta) 1892 bpf_obj_init(meta->record, p); 1893 return p; 1894 } 1895 1896 /* Must be called under migrate_disable(), as required by bpf_mem_free */ 1897 void __bpf_obj_drop_impl(void *p, const struct btf_record *rec) 1898 { 1899 if (rec && rec->refcount_off >= 0 && 1900 !refcount_dec_and_test((refcount_t *)(p + rec->refcount_off))) { 1901 /* Object is refcounted and refcount_dec didn't result in 0 1902 * refcount. Return without freeing the object 1903 */ 1904 return; 1905 } 1906 1907 if (rec) 1908 bpf_obj_free_fields(rec, p); 1909 bpf_mem_free(&bpf_global_ma, p); 1910 } 1911 1912 __bpf_kfunc void bpf_obj_drop_impl(void *p__alloc, void *meta__ign) 1913 { 1914 struct btf_struct_meta *meta = meta__ign; 1915 void *p = p__alloc; 1916 1917 __bpf_obj_drop_impl(p, meta ? meta->record : NULL); 1918 } 1919 > 1920 __bpf_kfunc void *bpf_refcount_acquire_impl(void *p__refcounted_kptr, void *meta__ign) 1921 { 1922 struct btf_struct_meta *meta = meta__ign; 1923 struct bpf_refcount *ref; 1924 1925 /* Could just cast directly to refcount_t *, but need some code using 1926 * bpf_refcount type so that it is emitted in vmlinux BTF 1927 */ 1928 ref = (struct bpf_refcount *)p__refcounted_kptr + meta->record->refcount_off; 1929 1930 refcount_inc((refcount_t *)ref); 1931 return (void *)p__refcounted_kptr; 1932 } 1933
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